Dough-mixing machine



May 12, 1925. 1,537,259

F. NOTZ ET AL v DOUGH MIXIILING MACHINE Filed Dec. 8, 1924. 2 sheet -sheet 1 Ag 7%- fZir a? Gearge Hogan E Z jQ/QQ @4416? i May 12, 19,25. 1,537,259

F. NOTZ ET AL DOUGH MIXING MACHINE Filed Dec, 8, 1924 2 Sheets-Sheet 2 UNITED STATES 1,531,259 :PATENT OFFICE.

.rnmx no'rz AND GEORGE ROYAN, or crncAe'o, ILLINOIS, nssrenores TO AMERICAN- '"0VEN & COMPANY, OF CHICAGO, ILLINOIS, A. CORPORATION OF ILLI- NOIS.

notion-MIXING MACHINE.

Application filed December. 8, 1924. Serial No. 754,488. v

To all whom it comem:

Be it known that we, FELIX N012 and GEORGE ROYAN, citizens of the United- States, residing at Chicago, in the county of Cook and State-f Illinois, have invented certain new and useful Improvements in Dough-Mixin -Machines, of which we do declare the fo lowing to be a full, clear, and

exact description, reference being had to the drawings accompanying this specification. 1

The resent invention has for its object to provide an extremely simple and effective machine'for themixing and kneading of dough, and the invention consists in the features of novelty hereinafter described, illustrated in the accompanying drawings an particularly pointed out in the claims at the end of this specification.

Figure 1 is a view in vertical section on line 11 of Fig. 2 through the mixing chamber and mixing frame of the machine embodying our invention. Figure 2 is a view in central, vertical section through the mixing chamber, the mixing frame being shown in elevation. Figure 3 is a front edge view of the mixing frame. Flgure 4 is an end view of the mixing frame. Figures 5 I and 6 are views in section through the mixing frame on lines 55 and 6-6 respectively of Fig. 2. Figure 7 is a'sectional view through the mixing frame on line 7 of Fig. 2. Figure 8 is a detail view in section on line 8-8-of Fig. '2.

A designates a mixing chamber, the shape of this chamber-beingof familiar form and the top of the chamber being adapted to be closed by a suitable cover (not shown). Within the mixing chamber A is mounted a revoluble mixing frame that is formed of two end bars and two connecting arms. In practice, these end bars and arms will be formed as an integral casting. The mixin frame is shown as mounted upon a centrzfi shaft C that passes through suitable 'stufiing boxes in the end walls of the mixingchamber and is provided at one end with a gear wheel whereby revolution may be imparted to the shaft and the mixing able driving gear, in manner well understood in the art- Each of the end bars B, B of the mixing frame comprises a long member b and a short member Z) and the arms B and 13 extend between the outer end of the long member 6 of one end bar and the short member I) .of the opposite end bar. The mixingframe is free from all transverse obstruct-ions between the end bars B, B and between the shaft C (if a through shaft be used) and the arms B and B, so that as the mixing frame is revolved, the mass of dough may be more efiectively shifted endwise of the machine, as will hereinafter more fully appear.

As shown, the long member Z) of each end her of the mixing frame is of greater width adjacent the central portion of the end bar than at the outer portion thereof, and the front edge or working face of each long member I) is formed with a concave WOIK- ing surface D that is inclined or beveled inwardly from the outer portion of this work- "The working surface D of the member I) merges into the working surface of the adjacent arm B? or B where these parts join to form corners X and X of the mixing frame, and the diagonally opposite corners X and X of the mixing frame, where the longer members b-join the arms B or B will be seen to -be curved in opposite directions away from an imaginary plane (see lines 8-8, Fig. 4:), bisecting the mixing frame longitudinally through the center'of the shaft C and the shorter members bof the end bars. The parts of the frame upon opposite sides of the shaft 0 are identical in shape.

Each of the arms B and B extends in a line approximately parallel with the axis of the mixing frame to a point about midway the length of such arm (see Fig. 2) and from such point the arm curves gradually inward to its point of union with theshortmember b of the opposite end bar of the mixing frame, as at the corners Y and Y of .the

frame; and the part of the arm B or B nearest the long member I) of theend bar is adapted to travel in proximity to the walls i the sectional views Figs. 5 and 6 are illustrated the preferred shape of eachof these arms B and B at different points. That is to say, at the corners X and X of themixing frame adjacent the long members I) of theend bars, the working face of each arm B or B is inclined inwardly and rearwardly with respect to the path of travel of such arm, as shown at the bottom of Fig. 6, but this inward and rearward inclination of the working face of the arm gradually decreases towards the longitudinally central portion .of

the arm (see Fig. 5) and where the working face of the arm joins or merges into the working face of the short member 12 of the end bar (as shown in Fig. 8), such-inclination disappears.

The mixmg frame is preferably driven at a speed of approximately or revolutions per minute, but this speed may be varied somewhat to meet Warying conditions of the work. When the ingredients for the dough have been placed in the mixing chamber and revolution is imparted to the mixing frame, it is found in practice that a most rapid and effective mixing, kneading, stretching and aeration of the dough is secured. By reason of the novel construction and shape of. the mixing frame, practice has demonstrated that as the frame revolves, the dough is lifted by the arms B and B as they travel upwardly, but inasmuch as the outwardly curved portions of these arms B and B travel at some distance from the wall a of the mixing chamber, (as shown at the lowerright hand corner of Fig. 2), a mass. of dough extends around the outer edge of such curved portions of the mixing arm (at the corner Y, for example), and this mass tenacionsly adheres to the body of dough in the lower portion of the mixin chamber. The result is that there is, a stretc ing action between the mass of dough that is carried by the uptraveling corner X of the mixing frame nearest the longer member I) of the end bar and the body of dough in the opposite end of the mixing chamber adjacent the back wall a of the chamber, because of the quantity of dough that extends around the outer edge of the curved portion of this armf B at the corner 'Y and connects the upcarried mass with the body of the dough in the opposite end of the mixing chamber. Hence it will be seen that there is not only a diagonal stretching of the dough, but also a pulling or shiftin of the mass from one end of the mixing cl aamber towards the opposite end thereof. Asthe arm 13 passes the vertical center and moves downwardly, it carries a mass of dough forward and against the front or pressure wall a of .the mixing chamber. In like manner, as the arm B moves upwardly, this arm and the corner portion X of the mixing frame will lift a mass of dough and'carry it over and against the front or pressurewall a of the mixing chamber, and in doing so, the dough 'will be stretched in diagonal direction over the inwardly curved portion of the arm B and around the corner portion Y of the mixing frame. I

In practice, it-is found that this diagonal stretching of the dough, alternately in different directions, and the effective manner in which the arms B and B carry the masses of dough against the front or pressure Wall of the mixing chamber, not only insures a thorough kneading, stretching and aerating of the dough, but inasmuch as there is no transverse obstruction between the arms B and B and the end bars B and B'r 'of'the mixing frame, there is a gradual shifting'back and forth of the body of doughlbngitudinally of the mixing chamher. This movement of the body of dough is aided by the concave working faces of'the longer members 6 of the end bars, while at the same time the beveled edges of these end bars serve to cut or sever the dough from the-end wallsof 'themixing chamber and so prevent the adherence of the dough to such end walls from resisting the back and forth shifting of the body of the dough.

5 It will thus be seen that the inclined work ing surfaces D of the longer members I) of the end bars and the inclined corners X and X of the frame cooperate in imparting a back and forth longitudinal movement of the dough and this longitudinal back and forth movement is aided by thepulling or stretching of the dough around the curved portions ofthe arms B and B because the dough asit is being stretched around such curved portions, tends to pull or draw the oluble mixing frame therein comprising end bars having long and short members and arms connecting the short member of one end bar with the long member of the other end bar, each of. said end bars having the forward face of its longer member formed with a concave'working surface inclined inwardly towards the back edge of the bar. l

2. In a dough binationwith a mixing chamber, of a revolnble mixing frame therein comprising end bars and arms connecting said end bars, each of said end bars having its forward edge formed with concave beveled working surfaces inclined inwardl and towards the back edge of the bar, the inclined surface'of the outer ortion of each endbar merging into the orward working surface of the corner of the frame where the arm joins said end'bar.

3. In a dough mixing machine, the combination witha mixing chamber, of 9. revspect to a plane passing throughthe axes of towards the diagona the frame, so that each corner portion, when oluble mixing frame therein comprising end bars having long and short'members and arms connecting the short member ofone end bar with the lon end bar, each of sai end bars having the forward face of its longer member formed with a working surface inclined inwardly towards the back edge of the bar, the work ing faces of the corner portions of, the frame at the ends of the longer m'embersofthebar projecting in opposite directions with rerevolutionof the frame and through the shorter members of the bars, said workin faces of said corner portions being incline 1y opposite corners of moving forwardxthe dough, shall impel it also towards "the opposite end of the frame. 4. In a dough mixing machine, the eomr bination with a mixing chamber, of a rev-.

olnble mixing frame therein formed of two end bar's eachhaving a long and a short member, and two arms each extending between the longer member of one bar and the shorter member of the other bar, eachof.

said arms extending from the longer mem her-of one bar for a distancein a plane approximately parallel to the axis of the frame and thence curved gradually inward to the.

mixing machine, the com:

member of the other "members of the end bars, and said arms havthen forward work ng faces curved in bars, each of said arms extending fromthe end of the longer member of one bar-in a plane approximately parallel to thewall of the mixing chamber and thence curved grad-' ually inward to'the end of the shorter member 'ot the other end bar, the end portions of the longer members of the bars being curved in opposite directionsfrom a plane passing through the axis of revolution of the frame and through the shorter members of the end bars, said arms having their forward working faces cnrved'in the direction of their lengzh and having the portions 'oftheir.

wor 'ng faces adjacent the longer member's of the end bars inclined rearwardly and inwardly, the curvature andinclination of said .working faces diminishing towards the opposite ends of said arms.

6. In a dough mixing machine, the com- I bination with a mixing chamber,-of a rev end bars each having a long and a short member, and two arms connecting the end of the longer member of one bar tothe end of the shorter member of the other bar, said frame being free from transverse obstrucoluble mixing frametherein formed of two i "tions between its axis and said arms, each of said arms-'extendingfor a distance from the longer member of one bar in a plane ap roximately parallel to the wall of the mixing chamber and thence curved graduallyin-, wardly to the shorter member of the other.

end bar, the workingfaces of the diagonally opposite corner portions of'the frame at thefends of the longer members of the bars being curved in opposite directions with respect to a plane passing through the arms and through the shorter members of the wardly in opposite directions withrespect to said plane.

FELIX NOTZ. GEORGE ROYAN.

bars, said working faces'of said corner portions being inclined inwardly and rear- 

